Choose the correct statement(s) about electronic configuration of lanthanides :

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all the tripositive ions of the series are of the form $4 f^{n} (n = 1$ to 14 with increasing atomic number)

E.C. of $Gd = [Xe] 4 f^{7} 5 d^{1} 6 s^{2}$

E.C. of ${Gd}^{2 +} = [Xe] 4 f^{7} 5 d^{1}$

E.C. of $Ce = [Xe] 4 f^{1} 5 d^{1} 6 s^{2}$

answer is A, C, D, B.

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Detailed Solution

It should be noted that these elements' atoms exhibit electronic configurations with 6s² common but varied 4f level occupancy. However, all tripositive ions have the electrical configuration 4fⁿ, where n increases from 1 to 14 with increasing atomic number.

Electrical configuration of,

$Gd = [Xe] 4 f^{7} 5 d^{1} 6 s^{2}$

Electrical configuration of,

${Gd}^{2 +} = [Xe] 4 f^{7} 5 d^{1}$

Electrical configuration of,

$Ce = [Xe] 4 f^{1} 5 d^{1} 6 s^{2}$ .